ci: use cargo check for MSRV check

[cakebaker]

This PR uses cargo check instead of cargo test for the MSRV check in the CI.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.29%. Comparing base (fe0fd40) to head (5de84b9).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #278   +/-   ##
=======================================
  Coverage   99.29%   99.29%           
=======================================
  Files          20       20           
  Lines        3847     3847           
  Branches      121      121           
=======================================
  Hits         3820     3820           
  Misses         26       26           
  Partials        1        1           

Flag	Coverage Δ
macos_latest	99.29% <ø> (ø)
ubuntu_latest	99.29% <ø> (ø)
windows_latest	14.21% <ø> (ø)

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